Magazine publishing is a business. The goal of the business is to create a product that will appeal to a large enough audience to make a profit. “Issues of faith” absolutely do belong in a horse magazine if the target audience is people of faith who are also horse people and that target audience buys enough of the magazine to make it profitable.
If the “old” Western Horseman had been making a raging profit, do you think they would have changed it? Of course not. The publishers clearly identified a niche audience that they believed would make the magazine more profitable. What would you like them to do? Just ride the sinking ship into bankruptcy because “issues of faith don’t belong in a horse magazine?”
There are at least a dozen other horse magazines out there. If you’re not interested in reading Western Horseman with its “issues of faith,” then give your business to other magazines.